From Bob Kuehne, "this submission extends the osgViewer::RecordCameraPathHandler to have an optionally-enabled auto-incrementing filename. default behavior is still the same, but there's one new method to enable autoincrementing filenames."

From Robert Osfield, modified the above so that the number increments come after the filename rather than before.

include/osgViewer/ViewerEventHandlers

@@ -236,6 +236,8 @@ public:
         void setKeyEventTogglePlayback(int key) { _keyEventTogglePlayback = key; }
         int getKeyEventTogglePlayback() const { return _keyEventTogglePlayback; }
 
+        void setAutoIncrementFilename( bool autoinc = true ) { _autoinc = autoinc?0:-1; }
+
         virtual void getUsage(osg::ApplicationUsage &usage) const;
 
         bool handle(const osgGA::GUIEventAdapter &ea, osgGA::GUIActionAdapter &aa);
@@ -243,6 +245,7 @@ public:
 protected:
 
         std::string                                     _filename;
+        int                                             _autoinc;
         std::ofstream                                   _fout;
 
         int                                             _keyEventToggleRecord;

src/osgViewer/ViewerEventHandlers.cpp

@@ -15,9 +15,12 @@
 #include <float.h>
 #include <limits.h>
 
+#include <iomanip>
 #include <fstream>
 #include <sstream>
 
+#include <osgDB/FileNameUtils>
+
 #include <osgViewer/Viewer>
 #include <osgViewer/ViewerEventHandlers>
 
@@ -368,6 +371,7 @@ bool ThreadingHandler::handle(const osgGA::GUIEventAdapter &ea, osgGA::GUIAction
 
 RecordCameraPathHandler::RecordCameraPathHandler(const std::string& filename):
     _filename(filename),
+    _autoinc( -1 ),
     _keyEventToggleRecord('z'),
     _keyEventTogglePlayback('Z'),
     _currentlyRecording(false),
@@ -448,8 +452,17 @@ bool RecordCameraPathHandler::handle(const osgGA::GUIEventAdapter &ea, osgGA::GU
                     
                     if (!_filename.empty())
                     {
-                        osg::notify(osg::NOTICE)<<"Recording camera path to file "<<_filename<<std::endl;
-                        _fout.open(_filename.c_str());
+                        std::stringstream ss;
+                        ss << osgDB::getNameLessExtension(_filename);
+                        if ( _autoinc != -1 )
+                        {
+                            ss << "_"<<std::setfill( '0' ) << std::setw( 2 ) << _autoinc;
+                            _autoinc++;
+                        }
+                        ss << "."<<osgDB::getFileExtension(_filename);
+                        
+                        osg::notify(osg::NOTICE) << "Recording camera path to file " << ss.str() << std::endl;
+                        _fout.open( ss.str().c_str() );
                     }
                     else
                     {